K Centauri

{{Starbox observe

| epoch = J2000.0

| constell = Centaurus

| ra = {{RA|13|29|25.25471}}

| dec = {{DEC|−51|09|54.5048}}

| appmag_v = +5.04

}}

{{Starbox character

| type =

| class = A1V

| b-v = {{Val|+0.059|0.003}}

| u-b = +0.07

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|−2.0|4.2}}

| prop_mo_ra = -2.094

| prop_mo_dec = -5.548

| parallax = 7.9861

| p_error = 0.2224

| parallax_footnote =

| absmag_v = −0.91

}}

{{Starbox detail

| source =

| mass = 3.128

| radius = 6.635

| luminosity = 248

| temperature = 9,167

| gravity = 2.982

| metal_fe =

| rotational_velocity = {{Val|220.4|2.4}}

| age_gyr =

}}

{{Starbox catalog

| names = {{odlist | B=K Cen | CD=−50°7812 | HD=117150 | HIP=65810 | HR=5071 | SAO=240883 | GC=18220 }}

}}

{{Starbox reference

| Simbad = K+Cen

}}

K Centauri is a possible binary star in the southern constellation of Centaurus. It has a white hue and is bright enough to be visible to the naked eye, having an apparent visual magnitude of +5.04.

K Centauri is located at a distance of approximately 410 light years from the Sun based on parallax, and it has an absolute magnitude of −0.91. This is an ordinary A-type main-sequence star with a stellar classification of A1V. It is spinning rapidly with a projected rotational velocity of 220 km/s, which is giving it a pronounced equatorial bulge that is 25% larger than the polar radius.

Analysis of Hipparcos and Gaia astrometry suggests that the relatively large margins of error in the calculated parallax may be due to orbital motion caused by an unseen companion. The companion would be an {{jupiter mass|81|link=y}} object orbiting at about {{val|2|ul=AU}}.

References

{{Reflist|colwidth=30em|refs=

{{citation | postscript=.

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters | arxiv=1108.4971

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | s2cid=119257644

}}

{{citation

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| title=Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum

| display-authors=1 | journal=Astronomy & Astrophysics

| volume=531 | page=A143 |date=July 2011

| bibcode=2011A&A...531A.143D | arxiv=1012.4858

| doi=10.1051/0004-6361/201016386 | s2cid=119286673 | postscript=. }}

{{citation

| last1=Houk | first1=Nancy

| title=Michigan catalogue of two-dimensional spectral types for the HD stars

| volume=2 | location=Ann Arbor | year=1978

| publisher=Dept. of Astronomy, University of Michigan

| bibcode=1978mcts.book.....H | postscript=. }}

{{citation

| last1=van Belle, Gerard T.

| title=Interferometric observations of rapidly rotating stars

| journal=The Astronomy and Astrophysics Review

| volume=20 | issue=1 | page=51 | date=March 2012

| doi=10.1007/s00159-012-0051-2 | bibcode=2012A&ARv..20...51V

| postscript=. | arxiv=1204.2572 | s2cid=119273474

}}

{{citation |bibcode=2019A&A...623A..72K |title=Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly |journal=Astronomy and Astrophysics |volume=623 |pages=A72 |last1=Kervella |first1=Pierre |last2=Arenou |first2=Frédéric |last3=Mignard |first3=François |last4=Thévenin |first4=Frédéric |year=2019 |arxiv=1811.08902 |doi=10.1051/0004-6361/201834371 |s2cid=119491061 |postscript=. }}

{{citation |bibcode=2017MNRAS.471..770M |title=Fundamental parameters and infrared excesses of Tycho-Gaia stars |journal=Monthly Notices of the Royal Astronomical Society |volume=471 |issue=1 |pages=770 |last1=McDonald |first1=I. |last2=Zijlstra |first2=A. A. |last3=Watson |first3=R. A. |year=2017 |arxiv=1706.02208 |doi=10.1093/mnras/stx1433 |doi-access=free |s2cid=73594365 |postscript=. }}

}}

Category:A-type main-sequence stars

Category:Centaurus

Centauri, K

Category:Durchmusterung objects

117150

065810

5071